A US woman who shot and killed her husband and two adult children before taking her own life is thought to have committed the shocking crime as a result of being ostracised from the religion she was raised in.

Every time I tell a mate I’m doing a story on cryptocurrency, they invariably ask me the same two questions: should they invest their own hard-earned money, and which cryptocurrency will get them a Lamborghini/yacht/island quickest?

AFP welcomes citizenship revoking

Federal police believe stripping citizenship from dual citizens involved in terrorism would be another tool in their counter-terror armoury.

The federal government is drafting legislation to remove citizenship from dual nationals deemed to have joined or be supporting groups like Islamic State and says appropriate safeguards will be implemented.

"As many tools that we can have to try and combat this threat is what we're looking for," Australian Federal Police commissioner Andrew Colvin told Sky News on Thursday.